Knob attachment.



No. 632,66I. Patented s t. 5, I899. 0. STODDARD.

KNOB ATTACHMENT.

(Application filed Nov. 23, 1896. Renewed Janwlii, 1899.)

(No Model.)

ELT

IVZIWESSES VVEWTOfi UN TED STATES OSCAR STODDARD, OF DETROIT, MICHIGAN,ASSIGNOR TO THE SOREXVLESS DOOR KNOB COMPANY, OF SAME PLACE.

KNOB ATTACHM ENT.

SPECIFICATION forming part of Letters Patent No. 632,661, datedSeptember 5, 1899. A li tion fil d November 28, 1896. Renewed January13, 1899. Serial No. 702,023. (No model.)

To (alt whom it puny concern.-

Be it known that I, OSCAR STODDARD, a citizen of the United States,residing at Detroit, in the county of Wayne, State of Michigan,

5 have invented certain new and useful Improvements in Door-KnobAttachments; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which I it appertains to make and use the same, referoncebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

I This invention relates to door-knobs, and

especially to the manner of attaching the removable knob to theknob-spindle; and it consists in the construction and arrangement ofparts hereinafter fully set forth, and

pointed out particularly in the claims.

The object of the invention is to provide a simple and effective meansfor securing the.

removable knob to the knob-spindle without the use of screws or boltsand in which the arrangement is such as to provide for the accommodationof doors ofvarious thicknesses, to provide for automatically locking there movable knob when properly adjusted to prevent said knob frombecoming loose or acci- 3o dentally disengaged, and to enable the readyremoval of said knob when desired. This object is attained by themechanism illustrated in the accompanying drawings, in which 3 5 Figure1 is a plan view showing the application of my invention, the doorappearing in horizontal section. Fig. 2 is a vertical section throughthe door, rose-plate, and a portion of the knob-stem, the locking-dogand theknob-spindleappearingin elevation. Fig. 3 is an enlargedperspective of the lockingdog. Fig. 4: is an enlarged detail of thethreaded boss upon which the rose-plate is mounted and which embracesthe knob-stein,

showing the way therein which permits the locking-dog to be raised freefrom the notches in the knob-spindle.

Referring to the letters of reference, A designates the door; 13 and O,the knobs, of

which 0 is removable.

D designates the knob-spindle, which is made fast to knob B and isangular in crosssection, so as to enter a corresponding socket in thestern E'of the knob C, and is provided in one of its faces near its freeend witha scries of ratchet-teeth a, which are provided with oneinclined and one vertical face. Formed integral with the inner" end ofthe stem E of the knob O are two projecting fingers 1), (clearly shownin Fig. 1,) between the outer ends of which is pivoted, as at c, agravity-pawl or locking-dog F, which is provided at its opposite endwith a depending point e, which is adapted to engage the teeth a of theknob-spindle.

On referring to Figs. 2 and 3 it will be seen that there is an inclinedslot 01 formed in the end of the dog F, through which the pivotal pin 0passes, the purpose of which is to prevent the raising of the engagingend of said dog and the accidental disengagement thereof from the teethof the knob-spindle. It will be seen that the locking-dog when inposition lies parallel with and contiguous to the teeth of theknob-spindle when the end of said spindle is inserted in the shank E ofthe knob C. It will also be seen that as the knobspindle is inserted insaid shank the point e of the dog will ride over the teeth a, of thespindle, which action tends to move the dog outward, so that its pivotalpin 0 will lie in the lower end of the slot 01 therein, so that theengaging end of the dog is free to ride over the teeth of the spindle asit is entered in said socket. The spindle D enters the socket in theknob-stem E until the parts are in proper position, when the point e ofthe dog engages one of the teeth a on said spindle and locks the knob Cthereon. Were the dog F pivoted in the ordinary manner a sud- 9o den orunusual outward strain upon the knob 0 might cause said dog to disengageitself from the ratchet-teeth of the knob-spindle, permitting the knob Oto be Withdrawn. To obviate this I employ the inclined slot 01 in '9 5said dog,through which the pivot-pin 0 passes, by which means anyoutward strain upon either knob causes said dog to be drawn slightlyinward and the pin 0 to ride up the incline of the slot (Z, whereby thedogF is not .a thereof, but its point of fulcrum is moved so far towardthe center of said dog that the engaging end thereof cannot possiblyrise sufiiciently to disengage itself from the teeth of said spindle,thereby firmly locking the knob O thereto.

G designates a plate which issecured to the face of the door and whichis provided with an externally-threaded boss f, in which the knob-stem Eis adapted to turn and upon which is screwed the rose plate H. The innerwall of the boss f stands adjacent to the upper edge of the dog F and isprovided with a notch g therein, which permits of the outer end of saiddog being raised to disengage it from the ratchet-teeth of the knobstemwhen it is desired to remove the knob. Said dog is raised by theinsertion of the end of an awl or other pointed instrument in theaperture 2' in the end thereof and the turning of the knob-stein E untilsaid dog shall register with the notch or way g cut in the inner wall ofthe boss f, when said dog may he lifted out of engagement with theratchet-teeth of the knob-spindle and the knob O freely withdrawn. Toafford access to the dog F, so as to disengage it, the rose-plate H isfirst unscrewed from the boss f and moved outward on the knob-stem E,when the outer end of said dog is accessible.

Having thus fully set forth my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The combination of the knobs, the spindle fixed to one of said knobsand having ratchet-teeth on the opposite end thereof, the dog pivoted tothe knob-stem and engaging the ratchet-teeth of the knob-spindle, saiddog having an inclined slot therein through which its pivot-pin passes.

2. The combination of the knobs, the spindle attached to one of saidknobs and having ratchet-teeth at its opposite end, one of said knobsbeing detachable from said spindle andhaving a hollow knob-stem whichreceives the end thereof, the dog pivoted to the knobstem of theremovable knob and engaging the ratchet-teeth of the knob-spindle, thecollar or boss embracing said knob-stem and dog and havinga notch or waythereininto which the free end of said dog may be moved.

In testimony whereof I aflix my signature in presence of two witnesses.

OSCAR STODDARD.-

Witnesses:

WM. 0. MoOUNIe, EDGAR S. WHEELER.

